My 7yr old son was in a 10/12 from Target and they got too small. Ordered these in Large 14/16 and they are quite small. Green Adidas on top of gray 14/16 Hanes boxer briefs. The Hanes fit him perfect. The Adidas were too small. He is 65lbs and 52in...slim body type. He did like the feel of the material, says it is soft, waistband is stretchy, leg part is tight (he usually wears slim pants and they are baggy on him so this was surprising how tight the legs were). The legs also have a fairly short inseam.